User Manual

97
Figure 80 - Differentiation function
You can use the differentiation function to measure the instantaneous slope of a waveform. For
example, the slew rate of an operational amplifier may be measured using the differentiation
function. Note your measured values will depend on your choice of dx.
6.6 Integration
The MATH operation ∫dt (integration) calculates the numerical integral of the selected source.
∫dt calculates the integral of the waveform's data using the trapezoidal rule. The equation is:



n
0i
i0n
ytcI
 I
n
= approximate numerical integral of waveform with respect to time
 c
o
= arbitrary constant
 Δt = point-to-point time difference
 y
i
= sampled data point of selected analog channel or reference waveform
 i = data point index
The integration menu provides an Offset softkey that lets you set a DC offset correction for the
input signal. Small DC offsets in the integration function input (or even small oscilloscope
calibration errors) can cause the displayed integrated waveform output to ramp up or down. This
offset correction helps you level the integrated waveform.